My Lord, devotional service unto You is the only auspicious path. If one gives it up simply for speculative knowledge or the understanding that these living beings are spirit souls and the material world is false, he undergoes a great deal of trouble

Expressions researched:
"My dear Lord, devotional service unto You is the only auspicious path. If one gives it up simply for speculative knowledge or the understanding that these living beings are spirit souls and the material world is false, he undergoes a great deal of trouble"

Sri Caitanya-caritamrta

CC Madhya-lila

My dear Lord, devotional service unto You is the only auspicious path. If one gives it up simply for speculative knowledge or the understanding that these living beings are spirit souls and the material world is false, he undergoes a great deal of trouble. He only gains troublesome and inauspicious activities. His endeavors are like beating a husk that is already devoid of rice. His labor becomes fruitless.

CC Madhya 22.22, Translation and Purport

My dear Lord, devotional service unto You is the only auspicious path. If one gives it up simply for speculative knowledge or the understanding that these living beings are spirit souls and the material world is false, he undergoes a great deal of trouble. He only gains troublesome and inauspicious activities. His endeavors are like beating a husk that is already devoid of rice. His labor becomes fruitless.

This is a verse from Śrīmad-Bhāgavatam (SB 10.14.4).